I've been happy with mine, and have been using a variety of denims and twills for making mine. I'd say it's defintiely more durable than wood, and we used some flawed pieces I've got in the shop for hammer blocks when laying a hard wood floor here in the house, with little deformation to them. A normal knife isn't gonna be beaten on either. I keep the flawed blocks for clamping and such.
Joel Bolden had a piece of his he kept outside sitting on his deck year round, and it looked the same as the day he laid it out there.
Another nice thing about making your own is you have a much wider range of color and appearance.
I don't know how much pressure I'm using on mine, I just know it's a lot. 6-8 C clamps clamped down very tightly.
Beau Erwin